A neurotrauma is any kind of trauma or physical assault to the brain or spinal cord. This could include a blow or blunt injury (such as might occur in a motor vehicle accident) or a penetrating injury such as a bullet or knife wound.
Unfortunately it is more common than you might suspect. In the U.S. there are more than 230,000 brain injuries every year that go to the hospital. Of these, approximately 50,000 die and another 80,000 end up with some form of a disability. More than 12,000 Americans every year become paralyzed because of a spinal cord trauma. These statistics play out pretty consistently in other countries, with the added burden of low seat belt and airbag usage.